Classification of regions.

§ 52.2321 Classification of regions.

The Utah plan was evaluated on the basis of the following classifications:

Air quality control region Pollutant
Particulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Photochemical oxidants (hydrocarbons)
Wasatch Front IntrastateIIIII
Four Corners InterstateIAIAIIIIIIIII
Utah IntrastateIIIIIIIIIIIIIII

[37 FR 10898, May 31, 1972, as amended at 39 FR 16347, May 8, 1974]